Since 5p is a factor of 20p, it is automatically the GCF.
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30p = 20p + 5p + 5p 40p = 20p + 10p + 10p
20p,50p,5p,2p
5px4p=20p 5px5=25p so 20p-25p=-5p
9 x 5p 7 x 5p, 1 x 10p 5 x 5p, 1 x 20p 5 x 5p, 2 x 10p 3 x 5p, 1 x 10p, 1 x 20p 3 x 5p, 3 x 10p 1 x 5p, 4 x 10p 1 x 5p, 2 x 20p 1 x 5p, 2 x 10p, 1 x 20p
One 20p coin and one 5p coin.